Electric switch



Jan. 29, 1935. R. E. BATES 1,989,076

. ELECTRIC SWITCH Filed Dec. 2, 1931 7 f 9 v Q91 9 o o 5 25 INVENTORRajah E. 50125 ATTORNEY Patented Jan. 29, 1935 1,989,076

UNIT-ED STATESTPATENT OFFICE ELECTRIC SWITCH Ralph E. Bates, WestMedford, Mara, uaignor to Submarine Signal Company, Boston, Mass acorporation of Maine Application December 2, 1931, Serial No. 578,479Claims. (oi. 200-90) The present invention comprises an electric of thearmature 5 is a weight 12 by which the switch to produce a make andbreak of an elecvibrating system may be tuned. Adjacent to the triocircuit at a definite frequency. The make position of the weight 12 is astud 13 rigidly and break of the circuit might be impressed upon rivetedto the armature 5 and extending outward 5 any circuit in which currentvariations of the perpendicular thereto. Mounted also on the ar 5desired frequency are used and preferably in the mature 5 is thespringcontact element 14 which present invention is used in connectionwith a is bent in the form of a rectangular spring riveted radiofrequency meter in which the interrupted to the armature 5. At the endof the bent arm makes and breaks are impressed upon a circuit 14 is acontact element 15 adapted to contact in carrying a carrier wave.through the motion of the reed with the contact The invention morespecifically relates to a 16 adjustably positioned in the block 17 bymeans device that is used to start and stopthe conof the screw 18. Thestud 13 passes through a tinuously operating or vibrating switch whichhole in the bent spring 14 and the end of it rides forms a part of a.further operating circuit. upon a cam 19 which is shaped to force thestud The present invention finds particular appliand the armature 5 tothe left when the cam is 15 cation in the production of an interruptedor. rotating.

modulated radio frequency transmitter at a The cam has an abruptshoulder 20 which durdefinite low audiofrequency and particularly in aing the movement of the cam comes in place bea circuit or signalingsystem used for the transfore the end of the stud 13 at which time thestud 20 mission of a distress alarm system. In systems is suddenlyreleased and the reed allowed to move 20 of this nature it isquiteessential that the vibraits full motion to the right. The cam 19 isopertion of the reed establishing the modulating or ated by means of thehandle 21 by which the shaft interrupting frequency in the transmittingcir- 22 may be urned- Th Shaft 22 carryin he cult be establisheddefinitely and in a uniform cam 19 is m u in a k ar p vid d y fashion insuch a manner that successive manual the element 23 fastened to theplate 1, not shown 25 operations will not aflect the adjustment or thein the drawing.

tuning offthe vibratory system. Besides this the Plate 23 has a sideextension 24 to which is vibrator must be positively and definitelycomriveted a spr ng 25 normally positioned somewhat menced at a certaintime and likewise must be parallel to the armature 5. The p i 25 ridesstopped at a desired time. It is these features upon a cam 26 alsorigidly fix d t the Shaft 30 and others which the present inventionover- The cam 26 is circular in shape but has removed e therefrom twoparallel segments. The switch as The mechanism itself will be more fu11ydepositioned with one of the segments resting scribed in connection withthe drawing in which against the spring 25 is in the iofl ition asFigure 1 shows a plan view of the switch; Figure indicated by the legendin Figure 2. with the 35 .2. shows aview of the portion of the top ofthe other segment resting against the surface of the case containing theoperating dial; Figure 3 p n 25 the Switch is Positioned in its shows anend view of the elements shown in Figposition. The switch easily assumesin its tumure 1; and Figure 4 shows a view of the circuit ing ne f th sw pos i ns nd h handle or 40 employed in operating a radio frequencytransknob 21 is always rotated in the same direction, as 40 mitter.indicated by the arrow 27. a

In the present invention there is mounted on In the operation of thedevice the operator a proper plate 1 an electromagnet 2 of a uturns theknob 21 from. let us say, h off p shaped form having aligned poles 3 and4 beside sition to the o position In t ease the which is placed thearmature 5 carried as a part shoulder 20 of the cam 19 rides to aposition just 45 of a vibrating reed. The complete reed consists bov thpp edge of the Stud 3 in the c ockof a thin strip of spring metal 6preferably spring wise rotation of the arrow 27. When this point steelwhich is supported at one endon a, base 7 has been reached the armaturewhich has been by means of the clamp 8 and the clamping screws movedover to the left as far as possible is sud- 9 holding securely theflexible strip 6 in position. denly released a d fo w t s t e Sw 50 Thearmature. 5 is fastened to the spring eleover to the right making acontact between the ment 6 by means of the plate 10 through whichcontacts 15 and 16. This completes the circuit are placed the rivets11-11 riveting together the through the electromagnet 2, as indicated inFigspring 6, the armature 5 and the plate 10 formure 4, and therebyenergizes it to draw the arma- 56 ing a unitary vibratory structure. Atthe end ture to it and break the contact between the 66 electrodes 15and 16 whereby the electromag'net 2 becomes deenergized and the reedswings again to the right. As indicated in Figure 4 the making of thecontact between the electrodes 15 and 16 completes the circuit throughthe coil 28 of the electromagnet 29 and operates to interrupt the relaycircuit 30 made between the contacts 31 and 32 by moving to the rightthe contact 31 mounted on the armature 38.

The relay circuit 30 is connected to the radio frequency transmitter.The vibrating system is adjusted to a definite low'frequency and bymeans of the present invention the reed is operated 'withthe minimumpossibility of a change in this frequency in a simple manner. The springelement 14, it may be remarked, provides a yielding but positiveconnection between the contacts 15 and 16 and allows the reed to swingwithout its motion being affected. As indicated in Figure 4 a condenser34 may be provided acrossthese contacts to prevent arcing, if desired.The coil 2 may be connected directly to 110 volt line if it is of lowresistance by placing a resistance 35 in series with it.

Having now described my invention, I claim:

1. An electric switch of the kind described comprising a magnet and anarmature formed as a tuned reed, means for establishing and stopping thevibration of the reed comprising a cam formed-to force the reed into atensioned position and 'suddenlyrelease the same and means setting saidcam in said tensioned position.

2. An electric switch of the'kind described comprising a magnet andanarmature formed as a tuned reed, a contact switch, means connectingsaid contact switch in circuit with said magnet, said contact switchhaving one contact on said reed and adapted to open the magnet circuitwhen attracted by it, a cam operatlvely positioned with respect to saidreed, means for rotating said cam one half revolution to start and afurther half revolution to stop the vibration of said reed.

4. An electric switch of the kind described comprising a magnet and anarmature formed as a tuned reed, a contact switch, means connecting'saidcontact switch in circuit with said magnet, said contact switch havingone contact connected with said reed and adapted to open the magnetcircuit when attracted by it, a shaft having a handle, said shaftpositioned adjacent to said reed, a cam carried by said shaft and meansoperating therewith to force said reed into a tensioned position andrelease the same for operation, a second cam mounted on said shaft andhaving a spring contacting an extended surface of the same in theposition of operation and I stud and free said reed by the release ofthe stud on a portion of 'said cam carrying a periphery adapted to bepositioned parallel thereto.

RALPH E. BATES.

